Transpositional modulation and demodulation
First Claim
1. A method of modulating a carrier signal, the method comprising:
- generating a non-transpositional modulation (non-TM) signal from a first data signal, the non-TM signal having a frequency spectrum that occupies a bandwidth;
generating a first TM signal by;
generating a first modulation from a second data signal, andshifting the first modulation signal in frequency to an upper sideband in the frequency spectrum of the non-TM signal which lies within the bandwidth to provide the first TM signal, wherein the power of the first modulated signal is less than the power of the non-TM signal;
generating a second TM signal by;
generating a second modulation signal from a third data signal, andshifting the second modulation signal in frequency to a lower sideband in the frequency spectrum of the non-TM signal which lies within the bandwidth to provide the second TM signal, wherein the power of the second modulated signal is less than the power of the non-TM signal;
combining the non-TM signal with the first TM signal and the second TM signal on a common carrier signal to provide a combined signal; and
transmitting the combined signal.
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Accused Products
Abstract
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for modulating and demodulating transpositional modulated (TM) signals. One aspect features a method of modulating a carrier signal that includes the operations of generating a non-transpositional modulation (non-TM) signal from a first data signal, where the non-TM signal has a frequency spectrum that occupies a bandwidth. Generating a TM signal by generating a modulation from a second data signal, and shifting the modulation signal in frequency to an upper or lower sideband in the frequency spectrum of the non-TM signal which lies within the bandwidth of the non-TM signal, and where the power of the first modulated signal is less than a power of the non-TM signal. Combining the non-TM signal with the TM signal on a common carrier signal to provide a combined signal. Transmitting the combined signal.
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Citations
20 Claims
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1. A method of modulating a carrier signal, the method comprising:
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generating a non-transpositional modulation (non-TM) signal from a first data signal, the non-TM signal having a frequency spectrum that occupies a bandwidth; generating a first TM signal by; generating a first modulation from a second data signal, and shifting the first modulation signal in frequency to an upper sideband in the frequency spectrum of the non-TM signal which lies within the bandwidth to provide the first TM signal, wherein the power of the first modulated signal is less than the power of the non-TM signal; generating a second TM signal by; generating a second modulation signal from a third data signal, and shifting the second modulation signal in frequency to a lower sideband in the frequency spectrum of the non-TM signal which lies within the bandwidth to provide the second TM signal, wherein the power of the second modulated signal is less than the power of the non-TM signal; combining the non-TM signal with the first TM signal and the second TM signal on a common carrier signal to provide a combined signal; and transmitting the combined signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A transmitter configured to perform operations comprising:
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generating a non-transpositional modulation (non-TM) signal from a first data signal, the non-TM signal having a frequency spectrum that occupies a bandwidth; generating a first TM signal by; generating a first modulation from a second data signal, and shifting the first modulation signal in frequency to an upper sideband in the frequency spectrum of the non-TM signal which lies within the bandwidth to provide the first TM signal, wherein the power of the first modulated signal is less than a power of the non-TM signal; generating a second TM signal by; generating a second modulation signal from a third data signal, and shifting the second modulation signal in frequency to a lower sideband in the frequency spectrum of the non-TM signal which lies within the bandwidth to provide the second TM signal, wherein the power of the second modulated signal is less than the power of the non-TM signal; combining the non-TM signal with the first TM signal and the second TM signal on a common carrier signal to provide a combined signal; and transmitting the combined signal. - View Dependent Claims (17, 18)
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19. A transmitter comprising:
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at least one processor; and a data store coupled to the at least one processor having instructions stored thereon which, when executed by the at least one processor, causes the at least one processor to perform operations comprising; generating a non-transpositional modulation (non-TM) signal from a first data signal, the non-TM signal having a frequency spectrum that occupies a bandwidth; generating a first TM signal by; generating a first modulation from a second data signal, and shifting the first modulation signal in frequency to an upper sideband in the frequency spectrum of the non-TM signal which lies within the bandwidth to provide the first TM signal, wherein the power of the first modulated signal is less than a power of the non-TM signal; generating a second TM signal by; generating a second modulation signal from a third data signal, and shifting the second modulation signal in frequency to a lower sideband in the frequency spectrum of the non-TM signal which lies within the bandwidth to provide the second TM signal, wherein the power of the second modulated signal is less than the power of the non-TM signal; combining the non-TM signal with the first TM signal and the second TM signal on a common carrier signal to provide a combined signal; and transmitting the combined signal. - View Dependent Claims (20)
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Specification